Patent GB-582313-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/12
Filed: 1944-09-20
Abstract: 582,313. Making boots. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Sept. 20, 1944, No. 17925. Addition to 573,358. [Class 17 (i)] The mounting and operation of the retarder of the machine of the parent Specification is so arranged that, substantially at the beginning of upwipe, the retarder is tipped about its axis to clamp the upper on the wipers first at. the end of the toe. Thus, while the retarder is lifted by the wipers and an upward pull is applied to the upper margin, it is free to tip to a position to clamp the upper upon the wipers at the sides of the toe as well as at the end. The retarder during upwipe wipes the margin of the upper outwardly over the wipers. The margin of the upper is then wiped inwards over the insole and the retarder raised and tipped to cause pressure to be first released at the end of the toe while continuing to apply pressure at the toe sides. Finally the retarder is returned to starting position. Fig. 1 shows an illustrative machine in right-hand side elevation and Fig. 3 shows the position of operating parts prior to movement of wipers and retarders. The retarder 8, Figs. 1, 3 is supported at the lower end of a bar 10 pivoted about mid-way of its length and is constructed substantially as described in the parent Specification. The central member 14 of the retarder is mounted by ears 18 on a rod 16 so that the retarder may move as a whole about this rod. The bar 10 is pivoted on an arm 32 of a three-armed lever 34 loose on a rockshaft 36. A spindle 40 is pivotally mounted in a trunnion block 46 pivoted on another arm 38 of the lever 34 and, is screwed into a trunnion block 48 on an arm 42 of a two-armed lever 44 fast on the shaft 36 so that the arm 32 and bar 10 may be adjusted to vary the initial position of the retarder 8 heightwise of the shoe. An arm 54 fast on shaft 36 is connected by a link 56 to one arm 58 of a bell-crank lever pivoted on a horizontal shaft 62, the other arm 64 of the lever being operated through a roll 66 by a drop a on a cam 68 on the main shaft 70 of the machine, so as to impart movement from the shaft 36'and arm 32 to the bar 10 to cause the retarder to clamp the margin of an upper outspread on wipers 6 under the actions of springs 72, 74, the tension in which may be adjusted by a lever 78. Downward tipping movement of the retarder about the rod 16 towards the wiper to clamp the upper first at the end of the toe is controlled by a link 80, arms 82 of which are pivoted to the ears 18 on the retarder. The rear ends of the arms 82 are secured by a bolt 88 in slots 90 to a rearwardly extending arm 86 by a bolt 88: A slot 92 in the arm 86 is engaged by a stud 94 threaded in an arm 96 of the lever 34. A light spring 98 tends to turn the retarder about the rod 16 to a position where the stud 94 is in the forward end of the slot 92. The upper clamping face of the retarder is brought parallel to the plane of the wipers, after the retarder has been tipped to clamp toe end of the upper, by movement of rockshaft 36 through arm 96 and spring 98, by upwiping movement of the wipers to clamp the upper at the sides of the toe. An adjustable stop screw 100 in the rear end of the-arm 86 engages the stud 94 to limit the lost motion between the link 80 and arm 96 and control the time in the cycle when the retarder assumes this parallel position. A rise b on the cam 68 causes the bar 10 to lift and carry the retarder away 'from the upper first at the toe end, while allowing pull to continue longer at the sides of the toe end. The drop a and rise b on the cam 68 are formed by independently adjustable plates 102, 104 so that the points in the cycle when retarder starts to move down and when it leaves the upper in overwiping may be varied. A block 110 pivoted at 106 to the machine frame has a cam slot 112 in which the upper end of the bar 10 is located. The slot 112 is shaped to move the retarder in the latter part of its downward movement to the wipers, heelwards to position it in the toe end portion of the upper close to the toe end face of the last to clamp the upper on the wipers. During upwiping when the retarder is lifted by the wipers the bar 10 is swung reversely by the slot 112 to move the retarder bodily outwards over the wipers. An eccentric connection 134 between the bar 10 and arm 32 enables the lengthwise position of the retarder relatively to the shoe to be adjusted. Specification 520,194 is referred to